I adore Zack, but I just can't write him. I always end up writing somebody else's version of him. But with Reno and Rude I get a totally clear picture of who they are, According To Me. I dunno why. They just WORK for me. XD
I suck at the clones, too, and I've yet to brave the writing of Sephiroth. I think I'll work on the other Turks, first (I love Elena and Tseng, but rarely write them) before I move on to bigger game. XD